Pontiac Grand Prix Water Leak

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No, I sure didn't. Even with the new windshield it happened again. I was able to find the spot where it came in, way up under the dash, you'll find an opening you can put your finger through. Why it's there I don't know.I actually sold my car a couple of weeks ago.Good Luck!

Hey just wanted to reply to you.I have not had a problem with that spot again .I took my car to the dealer they found a leak in the cowl .They also wanted to charge me $ 325.00 to fix it even though it was still under warranty. and still is I plan to traed it in this springthanks fboy

I am also interested in unplugging the a/c drain line. Does anyone have ideas? I have a 2001 Grand Prix. The other tips have been helpful but my car is also getting wet on the front passenger side floor on warm dry days when I use my air conditioner. The blower is leaking water. Any help would be greatly appreciated. Thanks.

I was finally able to get this issue solve, i found the rubber strip that is under the plastic piece by the windshield and sure enough it was off so i glued it on with some rubber cement. fixed the rain problem but still had the ac condensation flowing back up because the drainage tube was clogged. couldnt find it on my own, took it to a garage that my father recommended and he put it up on the lift and showed me where it was at and stuck a small phillips screwdriver or and small thin metal object to stick up the tube and unplug it. it took like 2 seconds. it is hard to see the tube i wouldnt have found it on my own but on a lift it was easier to locate . it came down right around where the engine and tranny are, pretty much directly inline with the firewall but it was a very small tube like an 1/8 inch or something. the end of it was greenish because of the mold and gunk so it really didnt look like it could have been the tube but he stuck the screwdriver about 1 inch or so up into it and all of the water which wasnt really alot came right out and it solved the problem. you might be able to find it if you put it up on jack stands and have a little room to look around, that was my problem, i couldnt really see it from just looking underneath. but once it was on the lift it was definitely findable. good luck. i believe this will solve your problem.

Thanks bigskidogg. I found the drain on plugged it and the problem is sloved. I found the drain looking in from the top. In my 2001 Grand Prix under the dash on the passenger side, I had removed the cover over the blower, held in place by three anchors. I followed the pipe coming out of the blower into the firewall. Then I looked under the hood where this pipe should come out. There was the drain. a short elbow coming out and pointing down. It was difficult to reach but I was able to unplug it with a piece of stiff wire. My car has been dry since then. Thanks.

I have an 04 Grand Prix and lately I have noticed that whenever I get home from work or a drive anywhere, there is a nice puddle of water underneath the car where the A/C would normally drain out, except I haven't used the A/C. I've actually had the heater on. The puddle keeps getting bigger and bigger each time. This morning when I started the car and left for work, there was already a puddle of water in the driveway after the car running for only maybe 5 minutes. I popped the hood last night and found the water was coming out of a drain elbow that looks like it's going into the firewall. Why is my car leaking so much water on the ground???? I've never had this happen with any other car I've owned.

It doesn't get any better in 2006, my back passenger side foot well is a nice puddle and my car stinks like mold. Living in Florida, I can rest assured there is mold all over the car and it is now a health hazard. I would like to know why, if this has been an ongoing problem, hasn't GM done anything about it?

I have a 2004 Grand Prix and, like all of you, my passenger side floors and air conditioner have water leaking problems. My car also smells like mold and has since i bought it. When i speed up or go over a speed bump I can hear water sloshing around in engine/dashboard. The air-conditioned air smells terrible. I got my windshield fixed over a year ago and since then, the water leak on the floor has been minimal, but the air conditioner problem is bad. I'm taking it to the dealer tomorrow after reading this thread

I have a Grnd Prix that is doing exactly the same thing. Wet floor on the passenger side and a very annoying sloshing sound in engine/dashboard. Were you able to get your car fixed and if so can you share what was wrong?

My car is leaking water when it rains, it's a 2006 Pontiac Grand Prix GXP, 38,000 miles. The interior is ruined from the last rain storm and I am told by the dealer that this is my problem. It's probably a clogged drain line from the moonroof. They have a water guy on the schedule for Tuesdays, so if they know there is a problem,why isn't this recalled? My car is ruined and it is my responsibility.Even if i purchased an extended warranty water leaks are not covered. So I have a car GM certified vehicle with less than 38k miles, that has significant water damage and they are not responsible for any of it. I wash my car faithfully, and was told it's probably pine needles or anything clogging the drain line, but it's not they're problem. The car is ruined. Any suggestions?

I have the same problem, only I have a 2002 coupe and the water leaks onto the passenger side floorboard. I have determined that the problem is coming from faulty drainage in the door. Every car is designed to allow water to flow down the side windows and let some flow into the door itself and drain out the bottom. This design is what allows the window to be rolled up or down, however, in my case, and maybe yours, too much water enters the door from the space between the window and the seal on the bottom of the window. The excess water does not drain properly and backs up into the door, forcing it out into the car. It has not suffered water damage yet because I promptly dry it when it leaks, until I find a permanent fix, I will just stuff a towel between the bottom of the door and the interior of the car to prevent floorboard flooding.

I also had the same problem and spent over two thousand dollars before i found out what the problem was. All Pontiac grand prix from 1999-2009 that leak water on passenger floor is from the following: The front cowl panel, [Where windshield wipers are] Has a air box inside the panel, That when built has a two piece construction that is sandwiched together at factory, and over time, summer heat, Icy winters etc, dries out and allows water to get into air box and drip out below dash on passenger side. To fix: Remove wiper arms, remove cowl screen, and you will notice a box looking square on passenger side, Clean out in and around box opening top. Must be clean and dry. Next use ether urethane windshield sealant, or silicone water proof sealer. reseal all the way around box , [Where metal body meets air box.] Make sure to re seal all the way around air box and let dry overnite. You can buy ether sealants at your local automotive parts co.

I also had the same problem and spent over two thousand dollars before i found out what the problem was. All Pontiac grand prix from 1999-2009 that leak water on passenger floor is from the following: The front cowl panel, [Where windshield wipers are] Has a air box inside the panel, That when built has a two piece construction that is sandwiched together at factory, and over time, summer heat, Icy winters etc, dries out and allows water to get into air box and drip out below dash on passenger side. To fix: Remove wiper arms, remove cowl screen, and you will notice a box looking square on passenger side, Clean out in and around box opening top. Must be clean and dry. Next use ether urethane windshield sealant, or silicone water proof sealer. reseal all the way around box , [Where metal body meets air box.] Make sure to re seal all the way around air box and let dry overnite. You can buy ether sealants at your local automotive parts co.

Please let me know if this is something that you have fixed yourself or paid the Dealer to resolve. I have a 2006 GXP [40k miles] that is leaking from the MoonRoof as described in the previous post. There are stains developing on the interior roof (the cloth material just above the top of the door). Hopefully, I can clean out the MoonRoof drainage component myself. Or find out if the Dealer can fix this common issue most expeditiously ! Thanks :mad:

Please keep me posted on your progress. If you have any questions or concerns before or after you take your vehicle to the dealer, feel free to send me a personal message. Thank you!Joey, GM Customer Service

I am pleasantly surprised to view your post (gmcustsvc), I will consult J.R. Pontiac-GMC in Tampa, Fl this week, explain the issue, schedule repair, then update you on the resolution.Thank you very much for the concern expressed. Otherwise, I love the GXP Grand Prix. :shades:

My water leak is not on the floor, it is on the roof (inside) between the sunroof and the door (at the top). Other people have indicated that the sunroof has a drain that has become clogged. I am not able to locate this drain and now the entire roof (the ceiling, just above my head) has become stained and now smells like mold and mildew and needs to be replaced.

Has anyone experienced water filling up the area where the spare tire lays in the trunk? I have a 1999 Grand Prix GT and discovered the water in there last week.

The temperatures were below freezing and the tire was frozen in place in the area where it lays under the panel. Once my dad got the ice melted with a hair dryer, he had to bale the water out of the hole. It would have made a good fish bowl.

We kept a fan in it all day and also had to remove all of the carpet because it was soaked.

On a separate issue which led to finding the leak, I had to have my gas door replaced because one hinge had rusted away and the other was getting close. So the man who did my body work checked the trunk for leaks while he had my car and couldn't find any. He actually laid in the trunk while someone sprayed water all around the trunk, lights, spoiler, etc. and it did not leak.

I have a 97 Grand Prix and recently noticed after a two hour drive (running the A/C) we noticed quite a bit of water on rear floor. It was not raining nor had it been. When we stopped the car, we noticed that under the car stream of water coming from just behind the front door. There is a seam there and it is just about in the same area as the back floor board. This happended one time before -same trip but we thought grand nephews poured water on floor board-now not so sure. noone was around. Where can this water be coming from?

Anyone out there that can help with my leaking car. I have a Pontiac grandam 2004, every time when it rain I got puddle of water on the floor on the passenger,s side. I thought it was because on the right side of the windshield molding was missing, so I got that fixed but that didn't help. My car is still leaking. Again this morning my car was out in the lot in heavy rain, went to see if there was water, yeah, about 2" of water on the floor. This is been going on for about 2 weeks now. The leakage started about 2 weeks ago. I am tired of vacuuming the water out when every time it rain. However, it happen I was sitting in the car while it was pouring rain again, then I saw water was dripping from the fuse compartment and between the passenger's door. The water was dripping from the fuse box, down to speaker on the door and on to the floor. I just can't find where the water is sipping through. The door is shut tight and the window. But is still leaking. Please help!!!

im having the same problem, with my spare tire swimming in my trunk! i opened the back seat and had someone spray all the cracks around my trunk, no water, but when i had someone spray UNDER my car, thats when the water seemed slowly to trickle in. did you ever find anything on the issue?

When I bought this car with only 40,000 miles on it the first issue I ever had with it was when water started pouring out the back reading light on the driver side rear. I immediately took it in and they said a hose had just gotten loose and they fixed it. Here it is now 80,000 miles and not only is water coming pouring out the same light fixture , but also has escalated to come out where the roof meet the front driver side . My entire driver side roof is soaked , my seats, my floorboard , and now my new to me car is smelling of mold just like ever other car I have ever own. You have NO IDEA how that fact depresses me more then anything. If this is a well known error why hasnt there been some sort of recall. To fix the "hose falling off " issue.. I am not a mechanic so the idea of ripping my headliner down to try and fix this problem myself is not really a solution. Nor do I feel that a well known issue as this should be something I should be paying outlandish mechanic fees to just get fixed for what another 40,000 miles? This is ridiculous!